Type-writing machine.



D. BRIGGS.

TYPE WRITING MAGHINE.

APPLICATION FILED NOV. 15, 1906.

Patented Apr. 16, 1.912.

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TYPE WRITING MACHINE. APPLIGATION FILED NOV. 15 1906.

Patented Apr. 16, 1912.

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DANIEL BRIGGS, OF NEW YORK, N. Y., ASSIGNOR TO WYCKOFF, SEAMANS & BENEDICT, OF ILION, NEW YORK, A CORPORATION OF NEW YORK.

TYPE-WRITING MACHINE.

Specification of Letters Patent.-

Patented. Apr. 16, 1912.

Application filed November 15, 1906. Serial No. 343,567.

To all whom it may concern Be it known that I, DANIEL Braces, citizen of the United States, and resident of Richmond Hill, city of New York, in the county of Queens and State of New York, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a specification.

My invention relates to typewriting machines and more particularly to carriage feed or escapement mechanisms.

The object of my invention is to provide a simple and efficient carriage feed or escapement mechanism which is speedy in action, in which the load moved by the finger keys in actuating the escapement is greatly reduced; in which the liability of wear upon the parts is decreased, and in which a quick let-01f of the carriage is afforded.

To the above and other ends which will hereinafter appear, my invention consists of the features of construction, arrangements of parts and combinations of devices described in the following specification and set forth in the appended claim.

From certain aspects of my invention'it consists broadly in employing escapement devices comprising escapement surfaces, one of which is a roller against the periphery of which the other surface bears during the releasing operation of the devices.

One form in which experience has demonstrated the practicability and high efficiency of this invention is that illustrated in the accompanying drawings which show the invention applied to an escapement mechanism of the character employed in a No. 6 Remington typewriting machine. The invention, however, is equally applicable to other escapement mechanisms.

In the accompanying drawings, Figure 1 is a fragmentary, vertical, front to rear central sectional view of a sufiicient number of parts of a typewriting machine to illustrate my invention in its application thereto. Fig. 2 is an enlarged detail fragmentary side elevation showing a portion of the escapement mechanism. Fig. 3 is a rear elevation of so much of the mechanism as is shown in Fig. 2. Fig. 4: is a view corresponding to Fig. 2, with some of the parts omitted, but showing a different relation of the parts. Figs. 5, 6 and 7 are diagrammatic top plan views of a portion of the escapement mechanism showing different steps in the operation. Fig. 8 is a detail rear elevation of the roller dog of the escapement and a block on which it is mounted.

The frame of the machine comprises a base 1, corner posts 2 and a top plate 3. Key levers 4 are pivoted on a fulcrum bar 5 and are each provided with a finger key 6 and a restoring spring 7. Each key lever is pivoted at 8 to an upwardly extending two part link 9 which in turn is pivoted at 10.to an arm of a type bar 11 pivoted on a hanger 12 secured to the top plate of the machine. A universal bar 13 extends beneath the key levers and is connected near its ends to upwardly extending links 14 pivoted at their upper ends 15 to rearwardly extending arms 16 of a rock shaft 17. A depending crank 1 arm 18 projects from the rock shaft and has a rearwardly extending link 19 connected thereto. The rear end of the link 19 is pivoted at 20 to a bell crank lever 21 pivoted at 22 to a fixed bracket 23. An upwardly ex-.

tending link 24 is pivoted at its lower end to the bell crank lever 21 and at its upper end 25 to a forwardly projecting arm 26 of a dog rocker or frame, the rock shaft 27 of which is pivoted to rearwardly extending bracket arms 28 which project from a bracket plate 29 secured to the top plate of I the machine.

An adjustable device 30 is secured to the rock shaft 27 of the dog rocker by a set screw 31 and may be adjusted to any suitabl position around the shaft in order to vary the pressure of 'a dog rocker restoring spring 32. which is in the nature of a C- spring secured at one end by a screw 33 to the bracket plate 29 and bearing at its opposite or free end against laterally projecting pins 34 carried by the adjusting device. An upwardly extending arm 35 of the dog rocker is provided with laterally projecting lugs 36 between which a loose or stepping dog 37 is pivoted on a pivot pin 38 which extends between the lugs and is fixed in openings therein. A depending end or tailpiece 39 on the loose dog is adapted to bear against the adjacent face or side of the arm 35 of the dog rocker to form a stop for the loose dog in order to arrest it in its advance movement around the pivot 38 or the movement the dog receives when it is free from the escapement wheel as shown in Fig. 4:. The upper portion of the loose dog 37 is adapted to bear against an adjacent face of the upwardly extending arm 35 of the dog rocker as shown in Fig. 3 in order to arrest the movement of the dog in an opposite direction or when it is engaged by and under pressure of the escapement wheel. The loose dog is advanced to its forward position, when released from the escapement wheel, by a spring 40 which is secured to the dog rocker by a screw 41 and is bent to the right in Fig. 3 and passes through an opening in the upright arm 35 of the dog rocker and contacts with the loose dog above its pivot. This sprin 40 is reinforced by a second spring 42. i detachable block or fixed dog 43 (shown in detail in Fig. 8) is secured in place on the dog rocker by a screw 44. The block is beveled on one face as shown at 45 to form a bearing for one end of a roller 46, the pivot 47 of which is in the nature of a headed pin which is received and fixed at its lower end in a diagonal opening in the block 43. This roller with the block 43 takes the place of the usual rigid dog or detent in the No. 6 Remington machine and is positioned on the dog rocker as best shown in Figs. 3 and 4 in order to cooperate with teeth 48 of a carriage feed rack, shown in the present instance as an escapement wheel 49. These teeth are beveled at 48 on their rear faces in the same manner as the escapement wheel of the No. 6 Remington machine. The axis of the roller dog 46 is inclined to the plane of the working face of the loose or stepping dog and to the radius of the escapement wheel which passes through the engaged tooth, as best shown in Fig. 3; and said axis is also parallel with or is substantially parallel with the plane of the escapement wheel in one position of the dog rocker and is substantially in the plane of the escapement wheel in another position of the dog rocker, so that a line passing through the roller axis is at one time out of and at another time in the plane in which the wheel turns. Thus, when the parts are in their normal positions shown in Fig. 2 the axis of the roller 46 is parallel or substantially so with the plane of the escapement wheel and extends transversely of the axis of said escapement wheel and transversely of the axis of the rock shaft 27 of the dog rocker, whereas, when the dog rocker is in th position shown in Fig. 4 the axis of the roller is substantially in the plane of the escapement wheel.

The parts beingnormally disposed in the manner shown in Figs. 2, 3 and 5, the depression of a key will cause the upper end of the dog rocker to be moved forwardly so as to move the parts from the position shown in Figs. 2, 3 and 5 to the positions indicated in Figs. 4 and 6. During the for ward movement of the dog rocker just described the loose dog 37 will be moved out of contact with the tooth a of the escapement wheel and advanced to the position shown in Fig. 6 to cooperate with the next advancing tooth b of the escapement wheel on the return movement of the dog rocker, and the periphery of the roller dog will be brought into contact with the tooth a without affording a material advance of the es capement wheel, although there is or may be a slight drop effected as the loose dog is disengaged from the tooth a and the roller dog 46 is engaged by the same tooth. The tooth of the escapement wheel when released from the loose dog is brought into contact with the periphery of the roller dog near the end thereof which is next to the dog rocker.

The dog rocker has a stop screw 35 threaded through it, and the forward end of said screw is adapted to strike a stop lug 35 on the bracket plate 29, to arrest the forward motion of the dog rocker, and the extreme operated position of the dog rocker is thus determined. This extreme forward or operated position of the dog rocker may be varied by adjusting the screw 85 and the connections between the dog rocker and the keys. In the drawings, the parts are shown so adjusted that, when the dog rocker is in its extreme forward position, shown in Fig. 4, the axis of the roller 46 is just about in the plane of the rear face of the escapement wheel, so that it is the rearmost point of the edge of the tooth 48 that contacts with the roller, and so that the pressure of the tooth against the roller is substantially radial of the roller, and does not tend to turn the roller about its axis nor to press the roller and dog rocker toward the back of the machine and so that the teeth of the escape ment wheel engage the roller dog at about the highest portion thereof, considered with reference to the travel or movement of the teeth of the escapement wheel.

The positions of the parts just described are those attained at a full depression of a finger key. As soon as pressure on the finger key is released and the dog rocker starts to move rearwardly or back to normal position the axis of the roller immediately passes out of the plane of the escapement wheel, and said wheel begins to turn, the pressure of its tooth 48 against the roller assisting in returning the dog rocker. As the roller moves backward toward its normal position, it is rotated by the tooth 48, and said tooth also moves along the roller lengthwise thereof, finally escaping from the upper end of theroller. This motion of the tooth 48 lengthwise of the roller is, of course, due to the inclination at which said roller is set. If the roller were held against rotation about its axis, the point of the tooth 48 in moving over the surface of the roller would follow a path represented in Fig. 2 by the which path is a diagonal one in a direction around the roller and toward the upper end of it. As a matter of fact, the tooth turns the roller and at the same time slides toward the upper end of it. Because of the curve of the roller 46 and of the fact that it is pivotally mounted, an advance movement of the escapement wheel begins the instant pressure is removed or lessened on the finger key and a quick letoif of the carriage is effected. At the same time it will be understood that during the time a tooth of the escapement wheel is in engagement or contact with the periphery of the roller dog and a relative movement between the dog rocker and escapement wheel is being eflected, a rotation of the roller dog will take place, the engaged contact surface of the roller moving in the same general direction as the engaged tooth of the escapement wheel, thus affording an easy and rapid movement of the parts. Each actuation of the escapement presents a different surface of the roller dog for cooperation with the teeth of the escapement wheel. The inclination of the roller increases the quickness of the let-ofi, because with this construction the tooth 48 not only rolls off of the roller as it would if said roller were vertical, but also slides along the roller from right to left in Fig. 3, so that, when the tooth escapes from the roller it has moved farther than it would if said roller were vertical. A quick let-off is afforded by the fixed dog being replaced by a roller, the periphery of which is engaged by the teeth of the escapement wheel, but the quickness of the let-ofl' is somewhat increased by the inclination of the roller.

The escapement wheel is operatively connected in the usual manner to a feed pinion broken line 0,

50 which cooperates with a feed rack 51 pivotally connected at 52 to the carriage 53. The carriage is or may be of any suitable character such as that employed, for instance, in the No. 6 Remington machine, and further description thereof is deemed unnecessary, except to point out that the carriage is preferably of a spring impelled or power driven type and the pressure exerted by the usual spring drum (no-t shown) of the carriage turns the escapement wheel to afford a step-by-step movement of the carriage when the feed dogs are actuated.

Various changes may be made in the construction without departing from the scope of my invention.

What I claim as new and desire to secure by Letters Patent, is

In a typewriting machine, the combination of a carriage; and escapement mechanism therefor, said escapement mechanism comprising an escapement wheel, a dog rocker pivoted on an axis at right angles to the axis of the escapement wheel a roller dog pivoted on the dog rocker and with the periphery of which the teeth of the escapement wheel are adapted to cooperate, the axis of the roller dog being inclined to the axis of the dog rocker and inclined to the axis of the escapement wheel when the axis of the roller dog is in the plane of the wheel.

Signed at the borough of Manhattan, city of New York, in the county of New York, and State of New York, this 14th day of November, A. D. 1906.

DANIEL BRIGGS.

WVitnesses:

E. M. WELLS, J. B. DEEVES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

